src/libcharon/plugins/uci/uci_config.c

   1 /*
   2  * Copyright (C) 2008 Thomas Kallenberg
   3  * Copyright (C) 2008 Tobias Brunner
   4  * Copyright (C) 2008 Martin Willi
   5  * Hochschule fuer Technik Rapperswil
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * for more details.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <string.h>
  20
  21 #include "uci_config.h"
  22 #include "uci_parser.h"
  23
  24 #include <daemon.h>
  25
  26 typedef struct private_uci_config_t private_uci_config_t;
  27
  28 /**
  29  * Private data of an uci_config_t object
  30  */
  31 struct private_uci_config_t {
  32
  33         /**
  34          * Public part
  35          */
  36         uci_config_t public;
  37
  38         /**
  39          * UCI parser context
  40          */
  41         uci_parser_t *parser;
  42 };
  43
  44 /**
  45  * enumerator implementation for create_peer_cfg_enumerator
  46  */
  47 typedef struct {
  48         /** implements enumerator */
  49         enumerator_t public;
  50         /** currently enumerated peer config */
  51         peer_cfg_t *peer_cfg;
  52         /** inner uci_parser section enumerator */
  53         enumerator_t *inner;
  54 } peer_enumerator_t;
  55
  56 /**
  57  * create a proposal from a string, with fallback to default
  58  */
  59 static proposal_t *create_proposal(char *string, protocol_id_t proto)
  60 {
  61         proposal_t *proposal = NULL;
  62
  63         if (string)
  64         {
  65                 proposal = proposal_create_from_string(proto, string);
  66         }
  67         if (!proposal)
  68         {       /* UCI default is aes/sha1 only */
  69                 if (proto == PROTO_IKE)
  70                 {
  71                         proposal = proposal_create_from_string(proto,
  72                                                                 "aes128-aes192-aes256-sha1-modp1536-modp2048");
  73                 }
  74                 else
  75                 {
  76                         proposal = proposal_create_from_string(proto,
  77                                                                 "aes128-aes192-aes256-sha1");
  78                 }
  79         }
  80         return proposal;
  81 }
  82
  83 /**
  84  * create an traffic selector, fallback to dynamic
  85  */
  86 static traffic_selector_t *create_ts(char *string)
  87 {
  88         if (string)
  89         {
  90                 int netbits = 32;
  91                 host_t *net;
  92                 char *pos;
  93
  94                 string = strdupa(string);
  95                 pos = strchr(string, '/');
  96                 if (pos)
  97                 {
  98                         *pos++ = '\0';
  99                         netbits = atoi(pos);
 100                 }
 101                 else
 102                 {
 103                         if (strchr(string, ':'))
 104                         {
 105                                 netbits = 128;
 106                         }
 107                 }
 108                 net = host_create_from_string(string, 0);
 109                 if (net)
 110                 {
 111                         return traffic_selector_create_from_subnet(net, netbits, 0, 0);
 112                 }
 113         }
 114         return traffic_selector_create_dynamic(0, 0, 65535);
 115 }
 116
 117 /**
 118  * create a rekey time from a string with hours, with fallback
 119  */
 120 static u_int create_rekey(char *string)
 121 {
 122         u_int rekey = 0;
 123
 124         if (string)
 125         {
 126                 rekey = atoi(string);
 127                 if (rekey)
 128                 {
 129                         return rekey * 3600;
 130                 }
 131         }
 132         /* every 12 hours */
 133         return 12 * 3600;
 134 }
 135
 136 /**
 137  * Implementation of peer_enumerator_t.public.enumerate
 138  */
 139 static bool peer_enumerator_enumerate(peer_enumerator_t *this, peer_cfg_t **cfg)
 140 {
 141         char *name, *ike_proposal, *esp_proposal, *ike_rekey, *esp_rekey;
 142         char *local_id, *local_addr, *local_net;
 143         char *remote_id, *remote_addr, *remote_net;
 144         child_cfg_t *child_cfg;
 145         ike_cfg_t *ike_cfg;
 146         auth_cfg_t *auth;
 147         lifetime_cfg_t lifetime = {
 148                 .time = {
 149                         .life = create_rekey(esp_rekey) + 300,
 150                         .rekey = create_rekey(esp_rekey),
 151                         .jitter = 300
 152                 }
 153         };
 154
 155         /* defaults */
 156         name = "unnamed";
 157         local_id = NULL;
 158         remote_id = NULL;
 159         local_addr = "0.0.0.0";
 160         remote_addr = "0.0.0.0";
 161         local_net = NULL;
 162         remote_net = NULL;
 163         ike_proposal = NULL;
 164         esp_proposal = NULL;
 165         ike_rekey = NULL;
 166         esp_rekey = NULL;
 167
 168         if (this->inner->enumerate(this->inner, &name, &local_id, &remote_id,
 169                         &local_addr, &remote_addr, &local_net, &remote_net,
 170                         &ike_proposal, &esp_proposal, &ike_rekey, &esp_rekey))
 171         {
 172                 DESTROY_IF(this->peer_cfg);
 173                 ike_cfg = ike_cfg_create(FALSE, FALSE,
 174                                         local_addr, IKEV2_UDP_PORT, remote_addr, IKEV2_UDP_PORT);
 175                 ike_cfg->add_proposal(ike_cfg, create_proposal(ike_proposal, PROTO_IKE));
 176                 this->peer_cfg = peer_cfg_create(
 177                                         name, 2, ike_cfg, CERT_SEND_IF_ASKED, UNIQUE_NO,
 178                                         1, create_rekey(ike_rekey), 0,  /* keytries, rekey, reauth */
 179                                         1800, 900,                                              /* jitter, overtime */
 180                                         TRUE, 60,                                               /* mobike, dpddelay */
 181                                         NULL, NULL,                                     /* vip, pool */
 182                                         FALSE, NULL, NULL);                     /* mediation, med by, peer id */
 183                 auth = auth_cfg_create();
 184                 auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
 185                 auth->add(auth, AUTH_RULE_IDENTITY,
 186                                   identification_create_from_string(local_id));
 187                 this->peer_cfg->add_auth_cfg(this->peer_cfg, auth, TRUE);
 188
 189                 auth = auth_cfg_create();
 190                 auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
 191                 if (remote_id)
 192                 {
 193                         auth->add(auth, AUTH_RULE_IDENTITY,
 194                                           identification_create_from_string(remote_id));
 195                 }
 196                 this->peer_cfg->add_auth_cfg(this->peer_cfg, auth, FALSE);
 197
 198                 child_cfg = child_cfg_create(name, &lifetime, NULL, TRUE, MODE_TUNNEL,
 199                                                                          ACTION_NONE, ACTION_NONE, FALSE, 0, 0,
 200                                                                          NULL, NULL);
 201                 child_cfg->add_proposal(child_cfg, create_proposal(esp_proposal, PROTO_ESP));
 202                 child_cfg->add_traffic_selector(child_cfg, TRUE, create_ts(local_net));
 203                 child_cfg->add_traffic_selector(child_cfg, FALSE, create_ts(remote_net));
 204                 this->peer_cfg->add_child_cfg(this->peer_cfg, child_cfg);
 205                 *cfg = this->peer_cfg;
 206                 return TRUE;
 207         }
 208         return FALSE;
 209 }
 210
 211 /**
 212  * Implementation of peer_enumerator_t.public.destroy
 213  */
 214 static void peer_enumerator_destroy(peer_enumerator_t *this)
 215 {
 216         DESTROY_IF(this->peer_cfg);
 217         this->inner->destroy(this->inner);
 218         free(this);
 219 }
 220
 221 /**
 222  * Implementation of backend_t.create_peer_cfg_enumerator.
 223  */
 224 static enumerator_t* create_peer_cfg_enumerator(private_uci_config_t *this,
 225                                                                                                 identification_t *me,
 226                                                                                                 identification_t *other)
 227 {
 228         peer_enumerator_t *e = malloc_thing(peer_enumerator_t);
 229
 230         e->public.enumerate = (void*)peer_enumerator_enumerate;
 231         e->public.destroy = (void*)peer_enumerator_destroy;
 232         e->peer_cfg = NULL;
 233         e->inner = this->parser->create_section_enumerator(this->parser,
 234                                         "local_id", "remote_id", "local_addr", "remote_addr",
 235                                         "local_net", "remote_net", "ike_proposal", "esp_proposal",
 236                                         "ike_rekey", "esp_rekey", NULL);
 237         if (!e->inner)
 238         {
 239                 free(e);
 240                 return NULL;
 241         }
 242         return &e->public;
 243 }
 244
 245 /**
 246  * enumerator implementation for create_ike_cfg_enumerator
 247  */
 248 typedef struct {
 249         /** implements enumerator */
 250         enumerator_t public;
 251         /** currently enumerated ike config */
 252         ike_cfg_t *ike_cfg;
 253         /** inner uci_parser section enumerator */
 254         enumerator_t *inner;
 255 } ike_enumerator_t;
 256
 257 /**
 258  * Implementation of peer_enumerator_t.public.enumerate
 259  */
 260 static bool ike_enumerator_enumerate(ike_enumerator_t *this, ike_cfg_t **cfg)
 261 {
 262         char *local_addr, *remote_addr, *ike_proposal;
 263
 264         /* defaults */
 265         local_addr = "0.0.0.0";
 266         remote_addr = "0.0.0.0";
 267         ike_proposal = NULL;
 268
 269         if (this->inner->enumerate(this->inner, NULL,
 270                                                            &local_addr, &remote_addr, &ike_proposal))
 271         {
 272                 DESTROY_IF(this->ike_cfg);
 273                 this->ike_cfg = ike_cfg_create(FALSE, FALSE, local_addr, IKEV2_UDP_PORT,
 274                                                                                 remote_addr, IKEV2_UDP_PORT);
 275                 this->ike_cfg->add_proposal(this->ike_cfg,
 276                                                                         create_proposal(ike_proposal, PROTO_IKE));
 277
 278                 *cfg = this->ike_cfg;
 279                 return TRUE;
 280         }
 281         return FALSE;
 282 }
 283
 284 /**
 285  * Implementation of ike_enumerator_t.public.destroy
 286  */
 287 static void ike_enumerator_destroy(ike_enumerator_t *this)
 288 {
 289         DESTROY_IF(this->ike_cfg);
 290         this->inner->destroy(this->inner);
 291         free(this);
 292 }
 293
 294 /**
 295  * Implementation of backend_t.create_ike_cfg_enumerator.
 296  */
 297 static enumerator_t* create_ike_cfg_enumerator(private_uci_config_t *this,
 298                                                                                            host_t *me, host_t *other)
 299 {
 300         ike_enumerator_t *e = malloc_thing(ike_enumerator_t);
 301
 302         e->public.enumerate = (void*)ike_enumerator_enumerate;
 303         e->public.destroy = (void*)ike_enumerator_destroy;
 304         e->ike_cfg = NULL;
 305         e->inner = this->parser->create_section_enumerator(this->parser,
 306                                                         "local_addr", "remote_addr", "ike_proposal", NULL);
 307         if (!e->inner)
 308         {
 309                 free(e);
 310                 return NULL;
 311         }
 312         return &e->public;
 313 }
 314
 315 /**
 316  * implements backend_t.get_peer_cfg_by_name.
 317  */
 318 static peer_cfg_t *get_peer_cfg_by_name(private_uci_config_t *this, char *name)
 319 {
 320         enumerator_t *enumerator;
 321         peer_cfg_t *current, *found = NULL;
 322
 323         enumerator = create_peer_cfg_enumerator(this, NULL, NULL);
 324         if (enumerator)
 325         {
 326                 while (enumerator->enumerate(enumerator, &current))
 327                 {
 328                         if (streq(name, current->get_name(current)))
 329                         {
 330                                 found = current->get_ref(current);
 331                                 break;
 332                         }
 333                 }
 334                 enumerator->destroy(enumerator);
 335         }
 336         return found;
 337 }
 338
 339 /**
 340  * Implementation of uci_config_t.destroy.
 341  */
 342 static void destroy(private_uci_config_t *this)
 343 {
 344         free(this);
 345 }
 346
 347 /**
 348  * Described in header.
 349  */
 350 uci_config_t *uci_config_create(uci_parser_t *parser)
 351 {
 352         private_uci_config_t *this = malloc_thing(private_uci_config_t);
 353
 354         this->public.backend.create_peer_cfg_enumerator = (enumerator_t*(*)(backend_t*, identification_t *me, identification_t *other))create_peer_cfg_enumerator;
 355         this->public.backend.create_ike_cfg_enumerator = (enumerator_t*(*)(backend_t*, host_t *me, host_t *other))create_ike_cfg_enumerator;
 356         this->public.backend.get_peer_cfg_by_name = (peer_cfg_t* (*)(backend_t*,char*))get_peer_cfg_by_name;
 357         this->public.destroy = (void(*)(uci_config_t*))destroy;
 358         this->parser = parser;
 359
 360         return &this->public;
 361 }
 362